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            <hgroup>
                <h1>World Wide Web</h1>
                <h2>From Wikipedia, the free encyclopedia</h2>
            </hgroup>

            <p class="note">
                "<abbr>WWW</abbr>" and "The Web" redirect here. For other uses of WWW, see WWW (disambiguation). For
                other uses of
                web, see Web (disambiguation).
                For the first web software, see WorldWideWeb.
                Not to be confused with the Internet.
            </p>
            <figure>
                <img
                    src="http://static001.geekbang.org/static/time/quote/World%20Wide%20Web%20-%20Wikipedia_files/300px-Web_Index.svg.png" />
                <figcaption>A global map of the web index for countries in 2014</figcaption>
            </figure>



            <p>
                The <strong>World Wide Web</strong>, also known as the WWW and the Web, is an information space where
                documents and other
                web resources are identified by Uniform Resource Locators (URLs), interlinked by hypertext links, and
                accessible via the Internet.[1] English scientist Tim Berners-Lee invented the World Wide Web in 1989.
                He wrote the first web browser in 1990 while employed at CERN near Geneva, Switzerland.[2][3] The
                browser was released outside CERN in 1991, first to other research institutions starting in January 1991
                and to the general public on the Internet in August 1991.
            </p>

            <nav>
                Contents
                <ol>
                    <li>History</li>
                    <li>
                        Function
                        <ol>
                            <li>Linking</li>
                            <li>Dynamic updates of web pages</li>
                            <li>WWW prefix</li>
                            <li>Scheme specifiers</li>
                        </ol>
                    </li>

                    <li>Web security</li>
                    <li>Privacy</li>
                    <li>Standards</li>
                    <li>Accessibility</li>
                    <li>Internationalisation</li>
                    <li>Statistics</li>
                    <li>Web caching</li>
                    <li>See also</li>
                    <li>References</li>
                    <li>Further reading</li>
                    <li>External links</li>
                </ol>
            </nav>


            Function

            The terms Internet and World Wide Web are often used without much distinction. However, the two are not the
            same.
            The <dfn>Internet</dfn> is a global system of interconnected computer networks.
            In contrast, the <dfn>World Wide Web</dfn>
            is a global collection of documents and other resources, linked by hyperlinks and URIs. Web resources are
            accessed using HTTP or HTTPS, which are application-level Internet protocols that use the Internet's
            transport protocols

            Viewing a web page on the World Wide Web normally begins either by typing the URL of the page into a web
            browser, or by following a hyperlink to that page or resource. The web browser then initiates a series of
            background communication messages to fetch and display the requested page. In the 1990s, using a browser to
            view web pages—and to move from one web page to another through hyperlinks—came to be known as 'browsing,'
            'web surfing' (after channel surfing), or 'navigating the Web'. Early studies of this new behaviour
            investigated user patterns in using web browsers. One study, for example, found five user patterns:
            exploratory surfing, window surfing, evolved surfing, bounded navigation and targeted navigation.[35]

            <samp>
                <pre>
        GET /home.html HTTP/1.1
        Host: www.example.org
    </pre>
            </samp>

            followed by the content of the requested page. HyperText Markup Language (HTML) for a basic web page might
            look like this:
            <code>
                <pre>
                    &lt;html&gt;
                        &lt;head&gt;
                            &lt;title&gt;www.Example.org – The World Wide Web&lt;/title&gt;
                        &lt;/head&gt;
                        &lt;body&gt;
                            &lt;p&gt;The World Wide Web, abbreviated as WWW and commonly known ...&lt;/p&gt;
                        &lt;/body&gt;
                    &lt;/html&gt;
                </pre>
            </code>
        </article>
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